audio: update XSD for dynamic engine loading support config

Bug: 141989952
Test: atest VtsHalAudioV6_0TargetTest

Change-Id: Ic0afc27f09d8387236444901dfddc5f0f074ba1b
Signed-off-by: François Gaffie <francois.gaffie@renault.com>
diff --git a/audio/6.0/config/audio_policy_configuration.xsd b/audio/6.0/config/audio_policy_configuration.xsd
index 05c8ab4..341c6b3 100644
--- a/audio/6.0/config/audio_policy_configuration.xsd
+++ b/audio/6.0/config/audio_policy_configuration.xsd
@@ -67,6 +67,7 @@
     <xs:complexType name="globalConfiguration">
         <xs:attribute name="speaker_drc_enabled" type="xs:boolean" use="required"/>
         <xs:attribute name="call_screen_mode_supported" type="xs:boolean" use="optional"/>
+        <xs:attribute name="engine_library" type="engineSuffix" use="optional"/>
     </xs:complexType>
     <xs:complexType name="modules">
         <xs:annotation>
@@ -624,4 +625,10 @@
             </xs:element>
         </xs:sequence>
     </xs:complexType>
+    <xs:simpleType name="engineSuffix">
+        <xs:restriction base="xs:string">
+            <xs:enumeration value="default"/>
+            <xs:enumeration value="configurable"/>
+        </xs:restriction>
+    </xs:simpleType>
 </xs:schema>